Study On The Analysis Of Microbial Ecology In Chilled Pork And Shelf Life Predictive Model

Chilled pork is a representative way of production and consumption and will be the new type of conformation in the fresh pork consumption in the future. However, the growth of contaminated microorganism that lead to the spoilage product has been become the great barrier for producer during slaughter, transportation and preservation, and the meat safety was the most attention problem for consumer. Presently, it is an effective measure of mathematics model to improve the inspect level of safety, because it can predict the shelf life of chilled pork. But it has no research in the chilled meat. This research is a part of the item entitled "The study and demonstration of quality control of chilled meat" (2001BA501A15-3) under key program of P. R. China. Starting with the investigation on the distribution and diversity of contaminated microorganism in chilled pork of different slaughter plant, we found out the microflora composition and diversity. With the help of traditional isolation technology, we obtained these dominant strains, and then studied the microbial effect on the chilled pork quality in order to find out the main spoilage organisms and establish the scientific quality predictive model. The aim is to provide a theory basis and technique for the inspection of quality and safety during the slaughter, transportation and preservation of chilled pork. The contents and results are as follows.1. Investigation of contaminated microorganism in the process of chilled porkThe level of contaminated microorganism in three great pig slaughter plants and different slaughter process were investigated. The result showed that the level of contaminated microorganism had the difference in different slaughter plants and different process. The TAPC (total aerobic psychrotrophic counts) were 4.5-5.5cfu/cm~2 in the surface of chilled pork after the slaughter among different orgin. After sprayed of 3.5% lactic acid, the TAPC of carcasses surface in skinless process were significance decreased to 2.951ogcfu/cm~2, but its have no effect on scalded process at the end of the slaughter line.